GROWTH OF SHELLS, 113 



for the slaughter. Nay, in all these things we are 

 more than conquerors through him that loved us. 

 For I am persuaded, that neither death, nor life, nor 

 angels, nor principalities, nor powers, nor things pre- 

 sent, nor things to come, nor height, nor depth, nor 

 any other creature, shall be able to separate us from 

 the love of God, which is in Christ Jesus our Lord." 

 It would be digressing too far from the object before 

 us to pursue the subject, though of infinitely the greater 

 importance ; but let not the reader neglect the high- 

 est wisdom, which is, to " cleave to the Lord with full 

 purpose of heait." 



To return to the subject we have left : in by far the 

 greater number of moUusca that inhabit univalve shells, 

 the formation and deposition of the earthy materials 

 do not proceed equally on all sides, as happens in the 

 limpets. If the increase takes place in the front only, 

 that is, in the fore part of the mantle, the continual 

 deflexion which thence arises necessarily gives the 

 shell a spiral form;, the coils being simply in one plane. 

 Most commonly, however, the deposit of shell occurs 

 laterally, and more on one side than on the other ; 

 hence the coils produced descend as they advance, 

 giving rise to a curve, which is continually changing its 

 plane. 



I 



